Add Hebrew Keyboard to Your Computer
Click on Time & Language.
Click on Language.
Under the "Keyboards" section, click the Add a keyboard button.
Select the new keyboard layout - Hebrew.
You should now have "Hebrew" under keyboard options and then you will start typing in Hebrew.
From the Apple menu visit “System Preferences”.
Choose “Language & Region” preference panel.
Under the ‘Preferred languages’ section, click on the plus [+] button.
Navigate & Select Hebrew, then click on the Add button.
You should now have the option to change to Hebrew at the top of the screen, like that: